Structure of the Earth

Question 1

What shape is the earth?

Answer 1

Spheroid (shaped like a ball, slightly flattened at the top and bottom)

Question 2

What are the 3 levels that the earth is made up of?

Answer 2

The Crust
The Mantle
The Core

Question 3

What is the outermost and thinnest layer?

Answer 3

The crust

Question 4

What is the crust made of

Answer 4

Hard rock

Question 5

How thick is the crust?

Answer 5

6KM

Question 6

Where is it thinnest?

Answer 6

Under the ocean

Question 7

Where is it thickest?

Answer 7

Under tall mountains

Question 8

What is the approximate temperature?

Answer 8

1200 degrees celsius

Question 9

What is the Moho?

Answer 9

Boundary between mantle & crust

Question 10

How thick is the mantle?

Answer 10

2900km

Question 11

Where do you find the mantle?

Answer 11

Between the crust and the core

Question 12

What is the top layer of the mantle made?

Answer 12

Hard rock

Question 13

What are the remaining layers made of?

Answer 13

Semi-molten rock

Question 14

What do temps of 5000 deg C cause?

Answer 14

Convection current (circular movement of material to move rock in the mantle)

Question 15

What is the central part of the earth?

Answer 15

The Core

Question 16

How thick is the core?

Answer 16

3400km

Question 17

Describe the 2 sections of the core.

Answer 17

Outer Core – molten 2000km
Inner Core – solid 1400km

Question 18

What is the core probably made of?

Answer 18

Minerals – Iron and Nickel

Question 19

Temperature of the Core?

Answer 19

5500 degrees C

Question 20

Other than the temp what is also high in the core?

Answer 20

Pressure

Question 21

What do the high temps in the Core cause?

Answer 21

Convection current (circular movement of material to move rock in the mantle)

Question 22

What are the giant slabs or pieces called that make up the earth’s surface?

Answer 22

Plates

Question 23

How wide can these be?

Answer 23

Thousands of km

Question 24

What is it called when two tectonic plates bump each other?

Answer 24

Earthquakes

Question 25

What provides the energy that causes plates to move in the crust?

Answer 25

Convection currents in the rock move through the mantle

Question 26

What is plate tectonics?

Answer 26

Movement of plates

Question 27

What is divergent movement?

Answer 27

When plates move away from one another in opposite directions.

Question 28

Example of Divergent movement?

Answer 28

South American plates and African plates

Question 29

What happens when 2 plates move aways from one another?

Answer 29

New land is constructed on the crust

Question 30

What convergent movement?

Answer 30

When the plates move toward each other

Question 31

Example of convergent movement?

Answer 31

The Eurasian plates and the pacific plate

Question 32

What is the result of convergent movement?

Answer 32

Land is lost or destroyed as one plate moves under the other back into the mantle

Question 33

What is transform movement?

Answer 33

When two plates slide past eachother

Question 34

What is an example of transform movement?

Answer 34

North American Plate at San Andreas Fault